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我有三種模型,故事,發佈和標記。 Story與Post有一對多的關係,與Tag有多對多的關係。嘗試鏈接使用group_by連接表上的搜索鏈接文本搜索時出現錯誤
我用下面的範圍來搜索具有匹配的標籤陣列中的至少一個標籤故事:
scope :in_tags, lambda {|category_array, tag_array|
Story.joins('LEFT OUTER JOIN stories_tags ON stories_tags.story_id = stories.id').
joins('LEFT OUTER JOIN tags ON tags.id = stories_tags.tag_id').
where("tags.name in (:tag_array)", :tag_array => tag_array).
group("stories.id")
}
請注意,我用GROUP_BY,這樣的範圍不返回一個故事多次如果該故事有多個匹配的標籤。
我用下面的pg_search_scope搜索故事或職位與指定的文本:
pg_search_scope :with_text,
:against => :title,
:using => { :tsearch => { :dictionary => "english" }},
:associated_against => { :posts => :contents }
這些示波器的兩個正常工作相互獨立的。當我嘗試鏈在一起,但是,我體驗到PostgreSQL的錯誤:
ActiveRecord::StatementInvalid (PG::Error: ERROR: column "pg_search_79dd68cf7f962ac568b3d7.pg_search_c5f43d73058486e1799d26" must appear in the GROUP BY clause or be used in an aggregate function
LINE 1: ...e"::text, '')) || to_tsvector('english', coalesce(pg_search_...
^
: SELECT "stories".*, ((ts_rank((to_tsvector('english', coalesce("stories"."title"::text, '')) || to_tsvector('english', coalesce(pg_search_79dd68cf7f962ac568b3d7.pg_search_c5f43d73058486e1799d26::text, ''))), (to_tsquery('english', ''' ' || 'track' || ' ''')), 0))) AS pg_search_rank FROM "stories" LEFT OUTER JOIN stories_tags ON stories_tags.story_id = stories.id LEFT OUTER JOIN tags ON tags.id = stories_tags.tag_id LEFT OUTER JOIN (SELECT "stories"."id" AS id, string_agg("posts"."contents"::text, ' ') AS pg_search_c5f43d73058486e1799d26 FROM "stories" INNER JOIN "posts" ON "posts"."story_id" = "stories"."id" GROUP BY "stories"."id") pg_search_79dd68cf7f962ac568b3d7 ON pg_search_79dd68cf7f962ac568b3d7.id = "stories"."id" WHERE (tags.name in (sports') AND (((to_tsvector('english', coalesce("stories"."title"::text, '')) || to_tsvector('english', coalesce(pg_search_79dd68cf7f962ac568b3d7.pg_search_c5f43d73058486e1799d26::text, ''))) @@ (to_tsquery('english', ''' ' || 'track' || ' ''')))) GROUP BY stories.id ORDER BY latest_post_id DESC LIMIT 5000 OFFSET 0):
有沒有辦法與要求與GROUP_BY子句的連接表一個範圍內使用pg_search?